从理论上分析了双向环形气体激光中的全饱和效应，导出了定态激光强度分布函数的解析形式，算出了定态双模强度的自相关和互相关函数。与激光的三次模型和实验测量相比较，激光的全饱和模型与实验测量符合得更好，而三次模型的结果偏差较大。 The full saturation effect in a two-way toroidal gas laser is theoretically analyzed, and the analytical form of the laser intensity distribution function is derived. The autocorrelation and cross-correlation functions of the bimodal intensity are calculated. Compared with the three laser model and the experimental measurement, the laser full-saturation model is in good agreement with the experimental measurement, while the three-model model has large deviation.